SW3221001_Supplement-EZ Form_20240411

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Brighton Park
2 Project Area(ac) 85.71
3 Coastal Wetland Area(ac)
4 Surface Water Area(ac) 1.065
5 Is this project High or Low Density? Both High and Low Density
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4) -=—=111
7 Width of vegetated setbacks provided(feet) 85
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 6
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Carlos L.Ruano,P.E.
28 Organization: Latham-Walters Engineering Inc.
29 Street address: 16507-A Norhcross Drive
30 City,State,Zip: Huntersville,NC 28078
31 Phone number(s): 704-895-8484
32 Email: [e-mail]
Certification Statement:
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the
information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans,
specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here.
Designer
00,0 1111110, /
\\Xs let CAR
SEAL — Signature of Designer
52356
C1 O.rolt E�� �
9�/P S L \\
�JP
/''/111i1 L j1\\\\\
Seal Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 6
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2 3 4
4 Type of SCM Sand Filter Sand Filter Sand Filter Sand Filter Sand Filter
5 Total drainage area(sq ft) 3733527.6 794099 449975 386377 416434
6 Onsite drainage area(sq ft) 3733527.6 794099 449975 386377 416434
7 Offsite drainage area(sq ft) 0 0 0 0
8 Total BUA in project(sq ft) 1297103 sf 387208 sf 192839 sf 171602 sf 188492 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 836600 225600 sf 138650 sf 117500 sf 129250 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 431071 161608 sf 54189 sf 54102 sf 59242 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots: 0
-Parking(sq ft) 11530 11530 sf
-Sidewalk(sq ft) 98707 32234 sf 14549 sf 12720 sf 13068 sf
-Roof(sq ft) 21780 21780 sf
-Roadway(sq ft) 299054 96063 sf 39640 sf 41382 sf 46174 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 35% 49% 43% 44% 45%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 32349 cf 16338 cf _ 14480 cf 15872 cf
21 Calculation method for design volume Simple Method Simple Method Simple Method Simple Method Simple Method
ADDITIONALD FORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 6
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 5 6 LD 1
4 Type of SCM Sand Filter Sand Filter Sand Filter
5 Total drainage area(sq ft) 3733527.6 351529 432986 902127.6
6 Onsite drainage area(sq ft) 3733527.6 351529 432986 902127.6
7 Offsite drainage area(sq ft) 0 0 0
8 Total BUA in project(sq ft) 1297103 sf 136941 sf 190589 sf 21873 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 836600 103400 sf 122200 sf sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 431071 33541 sf 68389 sf sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots: 0
-Parking(sq ft) 11530
-Sidewalk(sq ft) 98707 8712 sf 17424 sf
-Roof(sq ft) 21780
-Roadway(sq ft) 299054 24830 sf 50965 sf 21873 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) _
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 35% 39% 44% 2%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 11735 cf 16098 cf
21 Calculation method for design volume Simple Method Simple Method Simple Method
ADDITIONALDFORMATION _
Please use this space to provide any additional information about the
22 drainage area(s):

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 1.28
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%)
8 Bottom width of curb outlet swale(s)(feet)
9 Maximum side slope of curb outlet swale(s)(H:V)
10 Minimum length of curb outlet swale(s)(feet)
11 Are treatment swales used instead of curb outlet swales? No
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
Drainage Pervious
Swale Area BUA area C Q Slope Vaii0V, V.„, Flow depth
# (acl (ac) (acl (cfs) (%) (fps) (fps) (ft)
1 2.68 0.33 2.35 0.60 11.67 2.00 5.00 3.59 0.76
2 1.06 0.00 0.00 0.60 4.62 2.00 5.00 2.80 0.48
3 0.61 0.00 0.00 0.60 2.66 2.00 5.00 2.40 0.36
4 0.57 0.00 0.00 0.60 2.48 2.00 5.00 2.32 0.35
5 0.38 0.17 0.21 0.60 1.66 2.00 5.00 2.09 0.28
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

SAND FILTER
1 Drainage area number 1 2 3 4 5
2 Minimum required treatment volume(cu ft) 24262 sf 12253 sf 10860 sf 11904 sf 8801 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yco Yco Yes Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes
5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 3:1 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No No No No No
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes
(10-year storm)? _
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice I Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes
11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes Yes
12 Does the drainage easement comply with General MDC(9)? Yes Yes Yes Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with Yes Yes Yes Yes Yes
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes Yes Yes Yes
SAND FILTER MDC FROM 02H.1056 I
18 SHWT elevation(fmsl) 606.79 627.61 623 623.71 607.23
19 Type of sand filter(open or closed) Open Open Open Open Open
20 If closed,will the filter will be pre-cast or pour-in-place? N/A N/A N/A N/A N/A
21 If closed,top of grate elevation(fmsl) N/A N/A N/A N/A N/A
22 Is this sand filter designed to attenuate peak flows? Yes I Yes Yes Yes Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 19697 cf 14261 cf 11631 cf 12723 cf 9902 cf
24 Will there be a permanent pool in the sediment chamber? no no no no no
25 Bottom of the sediment chamber(fmsl) 611.00 633.00 628.00 631.00 613.00
26 Area of the sediment chamber(square feet) 8358 sf 8677 sf 5158 sf 5596 sf 4110 sf
27 Physical depth of the sediment chamber(inches) 24 in 18 in 24 in 24 in 24 in
28 Ponding depth in the sediment chamber,above any permanent pool 24 in 18 in 24 in 24 in 24 in
(inches)
29 Elevation of top of weir between chambers(fmsl) 613 I 634.5 630 I 633 615
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 16115 cf I 11669 cf 9516 cf 10410 cf 8102 cf
31 Bottom of the sand chamber(fmsl) 611.00 632.50 628.00 1 631.00 613.00
32 Area of the sand chamber(square feet) 6838 sf 7099 sf 4221 sf 4579 sf 3362 sf
33 Physical depth of the sand chamber(inches) 24 in 18 in 24 in 24 in 24 in
34 Ponding depth in the sand chamber,above the sand surface 24 in 18 in 24 in 24 in 24 in
(inches)
35 Elevation of the bypass device(fmsl) 613 634 630 633 615
36 Type of bypass device Orifice Orifice Orifice Orifice Orifice
37 Mechanism for distributing flow over the sand surface Riprap Riprap Riprap Riprap Riprap
38 Sand specification for sand chamber ASTM C33 ASTM C33 ASTM C33 ASTM C33 ASTM C33
39 Depth above underdrain pipe(inches) 12 in 18 in 18 in 18 in 18 in
40 Will the media be maintained to drain at least two inches per hour at Yes Yes Yes Yes Yes
the sand surface?
41 Is at least one clean-out pipe provided at the low point of each Yes Yes Yes Yes Yes
underdrain line? _
42 Will clean-out pipes be capped? Yes Yes Yes Yes Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about the
sand filter(s):
Sand Filter 5 2:24 PM 4/10/2024

SAND FILTER
1 Drainage area number 6
2 Minimum required treatment volume(cu ft) 12074 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? Yes
11 Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with Yes
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes
16 Does the SCM follow the device specific MDC? Yes
17 Was the SCM designed by an NC licensed professional? Yes
SAND FILTER MDC FROM 02H.1056
18 SHWT elevation(fmsl) 606
19 Type of sand filter(open or closed) Open
20 If closed,will the filter will be pre-cast or pour-in-place? N/A
21 If closed,top of grate elevation(fmsl) N/A
22 Is this sand filter designed to attenuate peak flows? Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 15808 cf
24 Will there be a permanent pool in the sediment chamber? no
25 Bottom of the sediment chamber(fmsl) 618.00 _
26 Area of the sediment chamber(square feet) 6956 sf _
27 Physical depth of the sediment chamber(inches) 24 in
28 Ponding depth in the sediment chamber,above any permanent pool 24 in
(inches)
29 Elevation of top of weir between chambers(fmsl) 620
Sand Chamber
_ 30 Volume that can be retained in the sand chamber(cubic feet) 12934 cf _
31 Bottom of the sand chamber(fmsl) 618.00 _
32 Area of the sand chamber(square feet) 5691 sf
33 Physical depth of the sand chamber(inches) 24 in
34 Ponding depth in the sand chamber,above the sand surface 24 in
(inches) _
35 Elevation of the bypass device(fmsl) 620 _
_ 36 Type of bypass device Orifice _
37 Mechanism for distributing flow over the sand surface Riprap _
38 Sand specification for sand chamber ASTM C33 _
39 Depth above underdrain pipe(inches) 18 in _
40 Will the media be maintained to drain at least two inches per hour at Yes
the sand surface? _
41 Is at least one clean-out pipe provided at the low point of each Yes
underdrain line?
42 Will clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about the
sand filter(s):
Sand Filter 6 2:24 PM 4/10/2024